Scraper



Nov. 4, 1958 A. J, BROWN ETAL SCRAPER 3 Sheets-Sheet 1 Filed Aug. 30, 1956 w .a V M5 W m. a JM O .mJ .MW

Nov. 4, 1958 Filed Aug. 30, 1956 A. J. BROWN ETL SCRAPER 3 SheetS-Shee'l'. 2

Nov. 4, 1958 A. J. BROWN ETAL 2,858,627

SCRAPER Filed Aug. .30, 1956 3 Sheets-Sheet 3 INVENroz w Aniong/ J .51mm

BY Jaga/1 3. 'z'lw ,Mag-WM United. States Patent v I SCRAPER Anthony J. Brown and Joseph B. Silva, Turlock, Calif.

Application August 30, 1956, Serial No. 607,224

" '7 claims. (C1. 37-4129) This nvention relates to scrapers, and in particular represents improvements over the scraper shown in our Patent No. 2,380,021, dated July 10, 1945.

The major objects of the present nvention are to provide improved and simplfied means for controlling the cooperative movements of the main and apron bowls, and to provide-in connection with the movement of the bowls to a closed load-transporting position-an increasedclearance of the bowls from the ground, and also to automatically provide a still greater clearance of the bowls from the ground when they are opened or spread apart for dumping of the load carried thereby.

Still another object of the nvention is to provide a practical, reliable, and durable scraper, and one which will be exceedingly effective for the purpose for which it is designed..

These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings:

Fig. 1 is a side elevation of the improved scraper showing the bowls in a load transporting position.

Fig. 2 is a similar view, mainly in section, and showing the main bowl in its digging position.

Fig. 3 is a side elevation showing the bowls in a dumping position.

Fig. 4 is a plan view of the scraper in the position of Fig. 1.

Fig. 5 is an enlarged fragmentary cross section taken on line 5-5 of Fig. 1.

Referring now more particularly to the drawings, and to the characters of reference marked thereon, the scraper comprises a main frame l'which includes spaced side beams 2, a forwardly projecting tongue 3 adapted for draft and supporting connection with a tractor, and a rear end cross beam 4 in the form of a rearwardly facing channel.

Wheels 5 are disposed just inwardly of the beams 2 and are mounted on forwardly projecting arms 6 secured at their forward end on the ends of a cross shaft 7 journaled in bearings 8 secured in channel 4.

An arm 9 projects upwardly from shaft 7 centrally of its ends and rigid therewith, said arm on its forward side abutting a stop 10 formed on the cross beam 4 when the arms 6 are in asubstantially level or horizontal position, as shown in Fig. 2. The arms 6 rearwardly of shaft 7 also then engage the overhanging top lip of the rear end portion of the beam 2, as shown in Fig. 5. The arms 6 are thus prevented from upward swinging from said level position.

Disposed between beams 2 ahead of rear beam 4 is the main bowl 11, which includes side plates 12, a back and bottom plate 13, and a cutting blade 14 across the forward end of said plate 13. The bowl is pivotally supported from beams 2 by trunnions 15 on the side plates 12 journaled in bearings 16 on said beams; said 'trunnions being directly above the blade 14 when the bowl is in .digging position, as shown in Fig. 2.

A front or .apron bowl 17 is disposed ahead of the main bowl,-and includes side plates 18 overlapping the side plates 12, and a bottom plate 19 having a rear edge 20 adapted to cooperate in closing relation with blade 14 when the bowl 11 is raised a certain distance from the ground, or to a transporting position as shown in Fig. 1. The bowl 18 is swung on trunnions 21 carried in bearings 22 on beams 2.

Coordinated swinging movement of bowls 11 and 17 between digging and carrying or transport positions is elfected by means of rollers 23 on the side plates 12 of bowl 11 engaging in suitably placed slots 24 in the side plates 18,of bowl 17 in offset relation to pivots 21, so that as bowl 11 is swung in one direction the bowl 17 is likewise swung but in the opposite direction.

Swinging movement is imparted to bowl 11 by means of a hydraulic cylinder unit or ram 25 pivoted at its forward end on a bracket 26 upstanding from tongue 3, and at its rear end, as at 27, on a plate or bracket 28 rigid with, and upstandng from, the back plate 13 at the top thereof; pivot 27 being thus of course above the pivotal aXis of the bowl 11.

As the ram 25 is extended to lift the bowl 11 to a transport position the bracket 28 is moved rearwardly until a roller 29 thereon engages in a seat 30 in the arm 9. This roller is disposed so that when the bowls have reached a fully closed transport position, the arm 9 has been forced back Vfrom its normal position sufficient to relatively lower the arm 6 and Wheels 5 somewhat. This actually raises frame 1 at its rear end, increasing the clearance of the closed bowls from the ground, as will be obvious, and as shown in Fig. 1.

When it is desired to dump the load, the ram is contracte-d. This causes bowl 11 to be swung forwardly to 'and beyond the digging position of Fig. 2; the bowl 17 swinging forwardly at the bottom to an open position by reason of the engagement of rollers 23 with the lower walls of slots 24. Roller 29 of course moves away from arm 9, and the frame 1 reassumes its initial position and level.

As the bowl 11 continues to swing so that the blade 14 is moved rearwardly and upwardly from the ground, the rollers 23 move down and'out from slots 24, leaving the lower portion of bottom plate 19 of bowl 17 substantially Vertical. Other rollers or stops 31 on the side plates 12 of bowl 11 then engage the side edges of plates 18 of bowl 17 to the rear of the slots 24, as shown in Fig. 3, and prevent any tendency of the otherwise unrestrained bow1'17 to swing rearwardly, and which would move the open end of slots 24 out of alinment with rollers 23.

At the same time, other rollers 32 on the side plates 12 of bowl 11 move upwardly and into engagement with the under side of arms 33 which project forwardly from the wheel-supporting arms 6 in rigid relation therewith and overlap said side plates 12.

The relationship of arms 33 to rollers 32 and to bowl 11 is such that when the ram 25 is fully contracted and the bowl has be'en swung to a full discharge position, the rollers 32 have lifted or swung the arms 33 a considerable distance above. their initial position. This causes the arms 6 to be again relatively lowered, and the adjacent portion of the frame 1 to be again lifted, but to a much greater extent than was obtained with the action of arm 9, as previously described.

The high lifting of the frame and bowls, particularly the main bowl 11, provides maximum clearance of the blade 14 of said bowl from the ground, and enables the scraper to be drawn forwardly from over the dumped load without appreciably-if at all-disturbing the latter.

From the foregoing description it will be readily seen that there has been Produced such a device as will substantially fulfill the objects of the invention, as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations Vfrom such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the ,appended claims.

Having thus described the invention the following is claimed as new and useful, and upon .which Letters Patent are desired:

1. In a scraper, a frame adapted at its forward end to be supported at a fixed level relative to the ground, Wheels adjacent the rearend of the frame, forwardly projecting wheel supporting arms, a transverse shaft rigid with the forward end of the arms and turnably mounted on the frame, a main bowl pivotally mounted on the frame for swinging movement from a digging to a carrying position, and cooperating means on the bowl and shaft to rotate .the latter in a direction to relatively lower the arms at their rear end by reason of and upon the bowl assuming a carrying position.

2. A structure, as in claim l, in which said last named means comprises an arm rigid with and projecting from the shaft, and an element fixed on the bowl in position to engage and move the arm so as to rotate the shaft upon movement of the bowl to a carrying position.

3. A structure, as in claim 1, the portion of the bowl above and rearwardly of the pivotal means thereof turning rearwardly as the bowl swings to a carrying position, and said last named means comprises an arrn rigid with and upstanding from the shaft, and an element fixed on the bowl at the top and adjacent the rear end thereof in position to engage and move the arm rearwardly upon such rearward turning movement of the upper portion of the bowl.

4. ln a scraper, a frame adapted at its forward end to be supported at a fixed level relative to the ground, a main forwardly opening bowl pivotally mounted on the frame for swinging movement between a digging and a dumping position, the bowl being pivoted so that its forwardly opening end moves upwardly and rearwardly as the bowl is swung from a digging to a dumping position, means to so swing the bowl, Wheels adjacent the rear end of the frame, means mounting the Wheels on the frame for Vertical movement of the frame at its rear end relative to the wheels and maintaining such end of the frame at a predetermined level relative to the ground when the bowl is in a digging position, and means on the bowl and engageable with the wheel mounting means -to effect an upward movement of the rear end of the frame from said predetermined level by reason of and upon the bowl assuming said dumping position.

5. En a scraper, a frame adapted at its forward end to be supported at a fixed level relative to the ground, a main forwardly opening bowl pivotally mounted on the frame for swinging movement between a digging and a dumping position, the bowl being pivoted so that'its forwardly opening end moves upwardly and rearwardly as the bowl is swung from a digging to a dumping position,

frame at a predetermined level relative to the ground when the bowl is in a digging position, the wheel mounting means comprising forwardly projecting wheel supporting arms, and a transverse shaft rigid with the for- Ward end of the arms and turnably mounted on the frame; and cooperating means on the bowl and shaft to rotate the latter in a direction to relatively lower the arms at their rear end by reason of and upon the bowl assuming a dumping position.

6. In a scraper, a frame adapted at its forward end to be supported at a fixed level relative to the ground, wheels adjacent the rear end of the frame, means mounting the Wheels on the frame for Vertical movement of the frame at its rear end relative to the wheels and normally maintaining such end of the frame at a predetermined level relative to the ground, a main forwardly opening bowl pivotally mounted on the frame for swinging movement between a digging and a dumping position, the bowl being pivoted so that its forwardly opening end moves upwardly and rearwardly as the bowl is swung from a digging to a dumping position, means to so swing the bowl, the wheel mounting means comprising forwardly projecting wheel supporting arms, and a transverse shaft rigid with the forward end of the arms and turnably mounted on the frame; and cooperating means on the bowl and shaft to rotate the latter in a direction to relatively lower the arms at their rear end by reason of and upon the bowl assuming a dumping position; said last named means comprising arms vrigid with the shaft and projecting forwardly therefrom in overlapping relation to the sides of the bowl, and elements on the sides of the bowl.

disposed rearwardly of vand -normally below the pivotal axis of the bowl and in position to engage the under side of the last named arms in lifting relation as the bowl is swung to a dumping position.

7. 'in a scraper, a frame adapted at its forward end to .be supported at a fixed level relative to the ground, a main bowl pivotally suspended from the frame for swinging movement in one direction from a digging to a carrying position and in the opposite direction from the carrying to a dumping position, means to so swing the bowl, Wheels adjacent the rear end of the frame, means mounting the .Wheels on the frame for Vertical movement of the frame at its rear end relative to the Wheels and maintaining such end of the frame at a predetermined `levelrelative to the ground when the bowl is in a digging position, cooperating means on the bowl and engageable withthe wheel mounting means to effect an. upward movement of the rear end of the frame from said `predetermined level upon ,the bowl being swung 'in said one direction to a carrying position, and separate cooperating means on the bowl and the wheel mounting means Vto effect a greater upward `movement of Vthe rear end of the frame from said predetermined level upon swinging of the bowl in the opposite direction to a dumping position.

References Cted in the file of this patent UNlTED STATES PATENTS 1,924,358 vHarrison Aug. 29, 1933 2,136,203 Adams Nov. 8, 1938 2,l96,690 Barrett Apr. 9, 1940 2,528,046 Engler Oct. 31, 1950 

